SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b36c8f0f97c32e0452c2573298a77ba7b9421bbb8829f729fa891f8a326ebf8' 
  AND token = 'EzGrVg69QackpP2gHZKyt1bRBRsjd+xxeTJKmHZ1UwY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}